package querylog import ( "bytes" "encoding/json" "os" "time" "github.com/AdguardTeam/golibs/errors" "github.com/AdguardTeam/golibs/log" ) // flushLogBuffer flushes the current buffer to file and resets the current buffer func (l *queryLog) flushLogBuffer(fullFlush bool) error { if !l.conf.FileEnabled { return nil } l.fileFlushLock.Lock() defer l.fileFlushLock.Unlock() // flush remainder to file l.bufferLock.Lock() needFlush := len(l.buffer) >= int(l.conf.MemSize) if !needFlush && !fullFlush { l.bufferLock.Unlock() return nil } flushBuffer := l.buffer l.buffer = nil l.flushPending = false l.bufferLock.Unlock() err := l.flushToFile(flushBuffer) if err != nil { log.Error("Saving querylog to file failed: %s", err) return err } return nil } // flushToFile saves the specified log entries to the query log file func (l *queryLog) flushToFile(buffer []*logEntry) (err error) { if len(buffer) == 0 { log.Debug("querylog: there's nothing to write to a file") return nil } start := time.Now() var b bytes.Buffer e := json.NewEncoder(&b) for _, entry := range buffer { err = e.Encode(entry) if err != nil { log.Error("Failed to marshal entry: %s", err) return err } } elapsed := time.Since(start) log.Debug("%d elements serialized via json in %v: %d kB, %v/entry, %v/entry", len(buffer), elapsed, b.Len()/1024, float64(b.Len())/float64(len(buffer)), elapsed/time.Duration(len(buffer))) var zb bytes.Buffer filename := l.logFile zb = b l.fileWriteLock.Lock() defer l.fileWriteLock.Unlock() f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0o644) if err != nil { log.Error("failed to create file \"%s\": %s", filename, err) return err } defer func() { err = errors.WithDeferred(err, f.Close()) }() n, err := f.Write(zb.Bytes()) if err != nil { log.Error("Couldn't write to file: %s", err) return err } log.Debug("querylog: ok \"%s\": %v bytes written", filename, n) return nil } func (l *queryLog) rotate() error { from := l.logFile to := l.logFile + ".1" err := os.Rename(from, to) if err != nil { if errors.Is(err, os.ErrNotExist) { return nil } log.Error("querylog: failed to rename file: %s", err) return err } log.Debug("querylog: renamed %s -> %s", from, to) return nil } func (l *queryLog) readFileFirstTimeValue() int64 { f, err := os.Open(l.logFile) if err != nil { return -1 } defer func() { derr := f.Close() if derr != nil { log.Error("querylog: closing file: %s", derr) } }() buf := make([]byte, 500) r, err := f.Read(buf) if err != nil { return -1 } buf = buf[:r] val := readJSONValue(string(buf), `"T":"`) t, err := time.Parse(time.RFC3339Nano, val) if err != nil { return -1 } log.Debug("querylog: the oldest log entry: %s", val) return t.Unix() } func (l *queryLog) periodicRotate() { intervalSeconds := uint64(l.conf.RotationIvl) * 24 * 60 * 60 for { oldest := l.readFileFirstTimeValue() if uint64(oldest)+intervalSeconds <= uint64(time.Now().Unix()) { _ = l.rotate() } time.Sleep(24 * time.Hour) } }